[28] | 1 | /* ezxml.c |
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| 2 | * |
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| 3 | * Copyright 2004-2006 Aaron Voisine <aaron@voisine.org> |
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| 4 | * |
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| 5 | * Permission is hereby granted, free of charge, to any person obtaining |
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| 6 | * a copy of this software and associated documentation files (the |
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| 7 | * "Software"), to deal in the Software without restriction, including |
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| 8 | * without limitation the rights to use, copy, modify, merge, publish, |
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| 9 | * distribute, sublicense, and/or sell copies of the Software, and to |
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| 10 | * permit persons to whom the Software is furnished to do so, subject to |
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| 11 | * the following conditions: |
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| 12 | * |
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| 13 | * The above copyright notice and this permission notice shall be included |
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| 14 | * in all copies or substantial portions of the Software. |
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| 15 | * |
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| 16 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, |
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| 17 | * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF |
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| 18 | * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. |
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| 19 | * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY |
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| 20 | * CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, |
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| 21 | * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE |
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| 22 | * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. |
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| 23 | */ |
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| 24 | |
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| 25 | #include <stdlib.h> |
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| 26 | #include <stdio.h> |
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| 27 | #include <stdarg.h> |
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| 28 | #include <string.h> |
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| 29 | #include <ctype.h> |
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| 30 | #include <unistd.h> |
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| 31 | #include <sys/types.h> |
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| 32 | #ifndef EZXML_NOMMAP |
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| 33 | #include <sys/mman.h> |
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| 34 | #endif // EZXML_NOMMAP |
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| 35 | #include <sys/stat.h> |
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| 36 | #include "ezxml.h" |
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| 37 | |
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| 38 | #define EZXML_WS "\t\r\n " // whitespace |
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| 39 | #define EZXML_ERRL 128 // maximum error string length |
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| 40 | |
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| 41 | typedef struct ezxml_root *ezxml_root_t; |
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| 42 | struct ezxml_root { // additional data for the root tag |
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| 43 | struct ezxml xml; // is a super-struct built on top of ezxml struct |
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| 44 | ezxml_t cur; // current xml tree insertion point |
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| 45 | char *m; // original xml string |
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| 46 | size_t len; // length of allocated memory for mmap, -1 for malloc |
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| 47 | char *u; // UTF-8 conversion of string if original was UTF-16 |
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| 48 | char *s; // start of work area |
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| 49 | char *e; // end of work area |
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| 50 | char **ent; // general entities (ampersand sequences) |
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| 51 | char ***attr; // default attributes |
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| 52 | char ***pi; // processing instructions |
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| 53 | short standalone; // non-zero if <?xml standalone="yes"?> |
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| 54 | char err[EZXML_ERRL]; // error string |
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| 55 | }; |
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| 56 | |
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| 57 | char *EZXML_NIL[] = { NULL }; // empty, null terminated array of strings |
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| 58 | |
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| 59 | // returns the first child tag with the given name or NULL if not found |
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| 60 | ezxml_t ezxml_child(ezxml_t xml, const char *name) |
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| 61 | { |
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| 62 | xml = (xml) ? xml->child : NULL; |
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| 63 | while (xml && strcmp(name, xml->name)) xml = xml->sibling; |
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| 64 | return xml; |
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| 65 | } |
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| 66 | |
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| 67 | // returns the Nth tag with the same name in the same subsection or NULL if not |
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| 68 | // found |
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| 69 | ezxml_t ezxml_idx(ezxml_t xml, int idx) |
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| 70 | { |
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| 71 | for (; xml && idx; idx--) xml = xml->next; |
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| 72 | return xml; |
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| 73 | } |
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| 74 | |
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| 75 | // returns the value of the requested tag attribute or NULL if not found |
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| 76 | const char *ezxml_attr(ezxml_t xml, const char *attr) |
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| 77 | { |
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| 78 | int i = 0, j = 1; |
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| 79 | ezxml_root_t root = (ezxml_root_t)xml; |
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| 80 | |
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| 81 | if (! xml || ! xml->attr) return NULL; |
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| 82 | while (xml->attr[i] && strcmp(attr, xml->attr[i])) i += 2; |
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| 83 | if (xml->attr[i]) return xml->attr[i + 1]; // found attribute |
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| 84 | |
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| 85 | while (root->xml.parent) root = (ezxml_root_t)root->xml.parent; // root tag |
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| 86 | for (i = 0; root->attr[i] && strcmp(xml->name, root->attr[i][0]); i++); |
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| 87 | if (! root->attr[i]) return NULL; // no matching default attributes |
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| 88 | while (root->attr[i][j] && strcmp(attr, root->attr[i][j])) j += 3; |
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| 89 | return (root->attr[i][j]) ? root->attr[i][j + 1] : NULL; // found default |
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| 90 | } |
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| 91 | |
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| 92 | // same as ezxml_get but takes an already initialized va_list |
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| 93 | ezxml_t ezxml_vget(ezxml_t xml, va_list ap) |
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| 94 | { |
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| 95 | char *name = va_arg(ap, char *); |
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| 96 | int idx = -1; |
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| 97 | |
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| 98 | if (name && *name) { |
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| 99 | idx = va_arg(ap, int); |
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| 100 | xml = ezxml_child(xml, name); |
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| 101 | } |
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| 102 | return (idx < 0) ? xml : ezxml_vget(ezxml_idx(xml, idx), ap); |
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| 103 | } |
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| 104 | |
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| 105 | // Traverses the xml tree to retrieve a specific subtag. Takes a variable |
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| 106 | // length list of tag names and indexes. The argument list must be terminated |
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| 107 | // by either an index of -1 or an empty string tag name. Example: |
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| 108 | // title = ezxml_get(library, "shelf", 0, "book", 2, "title", -1); |
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| 109 | // This retrieves the title of the 3rd book on the 1st shelf of library. |
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| 110 | // Returns NULL if not found. |
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| 111 | ezxml_t ezxml_get(ezxml_t xml, ...) |
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| 112 | { |
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| 113 | va_list ap; |
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| 114 | ezxml_t r; |
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| 115 | |
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| 116 | va_start(ap, xml); |
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| 117 | r = ezxml_vget(xml, ap); |
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| 118 | va_end(ap); |
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| 119 | return r; |
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| 120 | } |
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| 121 | |
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| 122 | // returns a null terminated array of processing instructions for the given |
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| 123 | // target |
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| 124 | const char **ezxml_pi(ezxml_t xml, const char *target) |
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| 125 | { |
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| 126 | ezxml_root_t root = (ezxml_root_t)xml; |
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| 127 | int i = 0; |
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| 128 | |
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| 129 | if (! root) return (const char **)EZXML_NIL; |
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| 130 | while (root->xml.parent) root = (ezxml_root_t)root->xml.parent; // root tag |
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| 131 | while (root->pi[i] && strcmp(target, root->pi[i][0])) i++; // find target |
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| 132 | return (const char **)((root->pi[i]) ? root->pi[i] + 1 : EZXML_NIL); |
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| 133 | } |
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| 134 | |
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| 135 | // set an error string and return root |
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| 136 | ezxml_t ezxml_err(ezxml_root_t root, char *s, const char *err, ...) |
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| 137 | { |
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| 138 | va_list ap; |
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| 139 | int line = 1; |
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| 140 | char *t, fmt[EZXML_ERRL]; |
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| 141 | |
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| 142 | for (t = root->s; t < s; t++) if (*t == '\n') line++; |
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| 143 | snprintf(fmt, EZXML_ERRL, "[error near line %d]: %s", line, err); |
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| 144 | |
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| 145 | va_start(ap, err); |
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| 146 | vsnprintf(root->err, EZXML_ERRL, fmt, ap); |
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| 147 | va_end(ap); |
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| 148 | |
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| 149 | return &root->xml; |
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| 150 | } |
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| 151 | |
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| 152 | // Recursively decodes entity and character references and normalizes new lines |
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| 153 | // ent is a null terminated array of alternating entity names and values. set t |
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| 154 | // to '&' for general entity decoding, '%' for parameter entity decoding, 'c' |
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| 155 | // for cdata sections, ' ' for attribute normalization, or '*' for non-cdata |
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| 156 | // attribute normalization. Returns s, or if the decoded string is longer than |
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| 157 | // s, returns a malloced string that must be freed. |
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| 158 | char *ezxml_decode(char *s, char **ent, char t) |
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| 159 | { |
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| 160 | char *e, *r = s, *m = s; |
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| 161 | long b, c, d, l; |
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| 162 | |
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| 163 | for (; *s; s++) { // normalize line endings |
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| 164 | while (*s == '\r') { |
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| 165 | *(s++) = '\n'; |
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| 166 | if (*s == '\n') memmove(s, (s + 1), strlen(s)); |
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| 167 | } |
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| 168 | } |
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| 169 | |
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| 170 | for (s = r; ; ) { |
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| 171 | while (*s && *s != '&' && (*s != '%' || t != '%') && !isspace(*s)) s++; |
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| 172 | |
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| 173 | if (! *s) break; |
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| 174 | else if (t != 'c' && ! strncmp(s, "&#", 2)) { // character reference |
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| 175 | if (s[2] == 'x') c = strtol(s + 3, &e, 16); // base 16 |
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| 176 | else c = strtol(s + 2, &e, 10); // base 10 |
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| 177 | if (! c || *e != ';') { s++; continue; } // not a character ref |
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| 178 | |
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| 179 | if (c < 0x80) *(s++) = c; // US-ASCII subset |
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| 180 | else { // multi-byte UTF-8 sequence |
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| 181 | for (b = 0, d = c; d; d /= 2) b++; // number of bits in c |
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| 182 | b = (b - 2) / 5; // number of bytes in payload |
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| 183 | *(s++) = (0xFF << (7 - b)) | (c >> (6 * b)); // head |
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| 184 | while (b) *(s++) = 0x80 | ((c >> (6 * --b)) & 0x3F); // payload |
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| 185 | } |
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| 186 | |
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| 187 | memmove(s, strchr(s, ';') + 1, strlen(strchr(s, ';'))); |
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| 188 | } |
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| 189 | else if ((*s == '&' && (t == '&' || t == ' ' || t == '*')) || |
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| 190 | (*s == '%' && t == '%')) { // entity reference |
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| 191 | for (b = 0; ent[b] && strncmp(s + 1, ent[b], strlen(ent[b])); |
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| 192 | b += 2); // find entity in entity list |
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| 193 | |
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| 194 | if (ent[b++]) { // found a match |
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| 195 | if ((c = strlen(ent[b])) - 1 > (e = strchr(s, ';')) - s) { |
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| 196 | l = (d = (s - r)) + c + strlen(e); // new length |
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| 197 | r = (r == m) ? strcpy(malloc(l), r) : realloc(r, l); |
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| 198 | e = strchr((s = r + d), ';'); // fix up pointers |
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| 199 | } |
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| 200 | |
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| 201 | memmove(s + c, e + 1, strlen(e)); // shift rest of string |
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| 202 | strncpy(s, ent[b], c); // copy in replacement text |
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| 203 | } |
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| 204 | else s++; // not a known entity |
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| 205 | } |
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| 206 | else if ((t == ' ' || t == '*') && isspace(*s)) *(s++) = ' '; |
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| 207 | else s++; // no decoding needed |
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| 208 | } |
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| 209 | |
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| 210 | if (t == '*') { // normalize spaces for non-cdata attributes |
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| 211 | for (s = r; *s; s++) { |
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| 212 | if ((l = strspn(s, " "))) memmove(s, s + l, strlen(s + l) + 1); |
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| 213 | while (*s && *s != ' ') s++; |
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| 214 | } |
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| 215 | if (--s >= r && *s == ' ') *s = '\0'; // trim any trailing space |
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| 216 | } |
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| 217 | return r; |
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| 218 | } |
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| 219 | |
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| 220 | // called when parser finds start of new tag |
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| 221 | void ezxml_open_tag(ezxml_root_t root, char *name, char **attr) |
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| 222 | { |
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| 223 | ezxml_t xml = root->cur; |
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| 224 | |
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| 225 | if (xml->name) xml = ezxml_add_child(xml, name, strlen(xml->txt)); |
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| 226 | else xml->name = name; // first open tag |
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| 227 | |
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| 228 | xml->attr = attr; |
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| 229 | root->cur = xml; // update tag insertion point |
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| 230 | } |
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| 231 | |
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| 232 | // called when parser finds character content between open and closing tag |
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| 233 | void ezxml_char_content(ezxml_root_t root, char *s, size_t len, char t) |
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| 234 | { |
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| 235 | ezxml_t xml = root->cur; |
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| 236 | char *m = s; |
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| 237 | size_t l; |
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| 238 | |
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| 239 | if (! xml || ! xml->name || ! len) return; // sanity check |
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| 240 | |
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| 241 | s[len] = '\0'; // null terminate text (calling functions anticipate this) |
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| 242 | len = strlen(s = ezxml_decode(s, root->ent, t)) + 1; |
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| 243 | |
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| 244 | if (! *(xml->txt)) xml->txt = s; // initial character content |
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| 245 | else { // allocate our own memory and make a copy |
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| 246 | xml->txt = (xml->flags & EZXML_TXTM) // allocate some space |
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| 247 | ? realloc(xml->txt, (l = strlen(xml->txt)) + len) |
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| 248 | : strcpy(malloc((l = strlen(xml->txt)) + len), xml->txt); |
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| 249 | strcpy(xml->txt + l, s); // add new char content |
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| 250 | if (s != m) free(s); // free s if it was malloced by ezxml_decode() |
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| 251 | } |
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| 252 | |
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| 253 | if (xml->txt != m) ezxml_set_flag(xml, EZXML_TXTM); |
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| 254 | } |
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| 255 | |
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| 256 | // called when parser finds closing tag |
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| 257 | ezxml_t ezxml_close_tag(ezxml_root_t root, char *name, char *s) |
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| 258 | { |
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| 259 | if (! root->cur || ! root->cur->name || strcmp(name, root->cur->name)) |
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| 260 | return ezxml_err(root, s, "unexpected closing tag </%s>", name); |
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| 261 | |
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| 262 | root->cur = root->cur->parent; |
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| 263 | return NULL; |
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| 264 | } |
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| 265 | |
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| 266 | // checks for circular entity references, returns non-zero if no circular |
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| 267 | // references are found, zero otherwise |
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| 268 | int ezxml_ent_ok(char *name, char *s, char **ent) |
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| 269 | { |
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| 270 | int i; |
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| 271 | |
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| 272 | for (; ; s++) { |
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| 273 | while (*s && *s != '&') s++; // find next entity reference |
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| 274 | if (! *s) return 1; |
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| 275 | if (! strncmp(s + 1, name, strlen(name))) return 0; // circular ref. |
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| 276 | for (i = 0; ent[i] && strncmp(ent[i], s + 1, strlen(ent[i])); i += 2); |
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| 277 | if (ent[i] && ! ezxml_ent_ok(name, ent[i + 1], ent)) return 0; |
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| 278 | } |
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| 279 | } |
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| 280 | |
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| 281 | // called when the parser finds a processing instruction |
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| 282 | void ezxml_proc_inst(ezxml_root_t root, char *s, size_t len) |
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| 283 | { |
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| 284 | int i = 0, j = 1; |
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| 285 | char *target = s; |
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| 286 | |
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| 287 | s[len] = '\0'; // null terminate instruction |
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| 288 | if (*(s += strcspn(s, EZXML_WS))) { |
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| 289 | *s = '\0'; // null terminate target |
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| 290 | s += strspn(s + 1, EZXML_WS) + 1; // skip whitespace after target |
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| 291 | } |
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| 292 | |
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| 293 | if (! strcmp(target, "xml")) { // <?xml ... ?> |
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| 294 | if ((s = strstr(s, "standalone")) && ! strncmp(s + strspn(s + 10, |
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| 295 | EZXML_WS "='\"") + 10, "yes", 3)) root->standalone = 1; |
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| 296 | return; |
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| 297 | } |
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| 298 | |
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| 299 | if (! root->pi[0]) *(root->pi = malloc(sizeof(char **))) = NULL; //first pi |
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| 300 | |
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| 301 | while (root->pi[i] && strcmp(target, root->pi[i][0])) i++; // find target |
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| 302 | if (! root->pi[i]) { // new target |
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| 303 | root->pi = realloc(root->pi, sizeof(char **) * (i + 2)); |
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| 304 | root->pi[i] = malloc(sizeof(char *) * 3); |
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| 305 | root->pi[i][0] = target; |
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| 306 | root->pi[i][1] = (char *)(root->pi[i + 1] = NULL); // terminate pi list |
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| 307 | root->pi[i][2] = strdup(""); // empty document position list |
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| 308 | } |
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| 309 | |
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| 310 | while (root->pi[i][j]) j++; // find end of instruction list for this target |
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| 311 | root->pi[i] = realloc(root->pi[i], sizeof(char *) * (j + 3)); |
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| 312 | root->pi[i][j + 2] = realloc(root->pi[i][j + 1], j + 1); |
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| 313 | strcpy(root->pi[i][j + 2] + j - 1, (root->xml.name) ? ">" : "<"); |
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| 314 | root->pi[i][j + 1] = NULL; // null terminate pi list for this target |
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| 315 | root->pi[i][j] = s; // set instruction |
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| 316 | } |
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| 317 | |
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| 318 | // called when the parser finds an internal doctype subset |
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| 319 | short ezxml_internal_dtd(ezxml_root_t root, char *s, size_t len) |
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| 320 | { |
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| 321 | char q, *c, *t, *n = NULL, *v, **ent, **pe; |
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| 322 | int i, j; |
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| 323 | |
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| 324 | pe = memcpy(malloc(sizeof(EZXML_NIL)), EZXML_NIL, sizeof(EZXML_NIL)); |
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| 325 | |
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| 326 | for (s[len] = '\0'; s; ) { |
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| 327 | while (*s && *s != '<' && *s != '%') s++; // find next declaration |
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| 328 | |
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| 329 | if (! *s) break; |
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| 330 | else if (! strncmp(s, "<!ENTITY", 8)) { // parse entity definitions |
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| 331 | c = s += strspn(s + 8, EZXML_WS) + 8; // skip white space separator |
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| 332 | n = s + strspn(s, EZXML_WS "%"); // find name |
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| 333 | *(s = n + strcspn(n, EZXML_WS)) = ';'; // append ; to name |
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| 334 | |
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| 335 | v = s + strspn(s + 1, EZXML_WS) + 1; // find value |
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| 336 | if ((q = *(v++)) != '"' && q != '\'') { // skip externals |
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| 337 | s = strchr(s, '>'); |
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| 338 | continue; |
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| 339 | } |
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| 340 | |
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| 341 | for (i = 0, ent = (*c == '%') ? pe : root->ent; ent[i]; i++); |
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| 342 | ent = realloc(ent, (i + 3) * sizeof(char *)); // space for next ent |
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| 343 | if (*c == '%') pe = ent; |
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| 344 | else root->ent = ent; |
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| 345 | |
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| 346 | *(++s) = '\0'; // null terminate name |
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| 347 | if ((s = strchr(v, q))) *(s++) = '\0'; // null terminate value |
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| 348 | ent[i + 1] = ezxml_decode(v, pe, '%'); // set value |
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| 349 | ent[i + 2] = NULL; // null terminate entity list |
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| 350 | if (! ezxml_ent_ok(n, ent[i + 1], ent)) { // circular reference |
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| 351 | if (ent[i + 1] != v) free(ent[i + 1]); |
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| 352 | ezxml_err(root, v, "circular entity declaration &%s", n); |
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| 353 | break; |
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| 354 | } |
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| 355 | else ent[i] = n; // set entity name |
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| 356 | } |
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| 357 | else if (! strncmp(s, "<!ATTLIST", 9)) { // parse default attributes |
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| 358 | t = s + strspn(s + 9, EZXML_WS) + 9; // skip whitespace separator |
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| 359 | if (! *t) { ezxml_err(root, t, "unclosed <!ATTLIST"); break; } |
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| 360 | if (*(s = t + strcspn(t, EZXML_WS ">")) == '>') continue; |
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| 361 | else *s = '\0'; // null terminate tag name |
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| 362 | for (i = 0; root->attr[i] && strcmp(n, root->attr[i][0]); i++); |
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| 363 | |
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| 364 | while (*(n = ++s + strspn(s, EZXML_WS)) && *n != '>') { |
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| 365 | if (*(s = n + strcspn(n, EZXML_WS))) *s = '\0'; // attr name |
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| 366 | else { ezxml_err(root, t, "malformed <!ATTLIST"); break; } |
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| 367 | |
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| 368 | s += strspn(s + 1, EZXML_WS) + 1; // find next token |
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| 369 | c = (strncmp(s, "CDATA", 5)) ? "*" : " "; // is it cdata? |
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| 370 | if (! strncmp(s, "NOTATION", 8)) |
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| 371 | s += strspn(s + 8, EZXML_WS) + 8; |
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| 372 | s = (*s == '(') ? strchr(s, ')') : s + strcspn(s, EZXML_WS); |
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| 373 | if (! s) { ezxml_err(root, t, "malformed <!ATTLIST"); break; } |
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| 374 | |
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| 375 | s += strspn(s, EZXML_WS ")"); // skip white space separator |
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| 376 | if (! strncmp(s, "#FIXED", 6)) |
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| 377 | s += strspn(s + 6, EZXML_WS) + 6; |
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| 378 | if (*s == '#') { // no default value |
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| 379 | s += strcspn(s, EZXML_WS ">") - 1; |
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| 380 | if (*c == ' ') continue; // cdata is default, nothing to do |
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| 381 | v = NULL; |
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| 382 | } |
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| 383 | else if ((*s == '"' || *s == '\'') && // default value |
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| 384 | (s = strchr(v = s + 1, *s))) *s = '\0'; |
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| 385 | else { ezxml_err(root, t, "malformed <!ATTLIST"); break; } |
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| 386 | |
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| 387 | if (! root->attr[i]) { // new tag name |
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| 388 | root->attr = (! i) ? malloc(2 * sizeof(char **)) |
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| 389 | : realloc(root->attr, |
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| 390 | (i + 2) * sizeof(char **)); |
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| 391 | root->attr[i] = malloc(2 * sizeof(char *)); |
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| 392 | root->attr[i][0] = t; // set tag name |
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| 393 | root->attr[i][1] = (char *)(root->attr[i + 1] = NULL); |
---|
| 394 | } |
---|
| 395 | |
---|
| 396 | for (j = 1; root->attr[i][j]; j += 3); // find end of list |
---|
| 397 | root->attr[i] = realloc(root->attr[i], |
---|
| 398 | (j + 4) * sizeof(char *)); |
---|
| 399 | |
---|
| 400 | root->attr[i][j + 3] = NULL; // null terminate list |
---|
| 401 | root->attr[i][j + 2] = c; // is it cdata? |
---|
| 402 | root->attr[i][j + 1] = (v) ? ezxml_decode(v, root->ent, *c) |
---|
| 403 | : NULL; |
---|
| 404 | root->attr[i][j] = n; // attribute name |
---|
| 405 | } |
---|
| 406 | } |
---|
| 407 | else if (! strncmp(s, "<!--", 4)) s = strstr(s + 4, "-->"); // comments |
---|
| 408 | else if (! strncmp(s, "<?", 2)) { // processing instructions |
---|
| 409 | if ((s = strstr(c = s + 2, "?>"))) |
---|
| 410 | ezxml_proc_inst(root, c, s++ - c); |
---|
| 411 | } |
---|
| 412 | else if (*s == '<') s = strchr(s, '>'); // skip other declarations |
---|
| 413 | else if (*(s++) == '%' && ! root->standalone) break; |
---|
| 414 | } |
---|
| 415 | |
---|
| 416 | free(pe); |
---|
| 417 | return ! *root->err; |
---|
| 418 | } |
---|
| 419 | |
---|
| 420 | // Converts a UTF-16 string to UTF-8. Returns a new string that must be freed |
---|
| 421 | // or NULL if no conversion was needed. |
---|
| 422 | char *ezxml_str2utf8(char **s, size_t *len) |
---|
| 423 | { |
---|
| 424 | char *u; |
---|
| 425 | size_t l = 0, sl, max = *len; |
---|
| 426 | long c, d; |
---|
| 427 | int b, be = (**s == '\xFE') ? 1 : (**s == '\xFF') ? 0 : -1; |
---|
| 428 | |
---|
| 429 | if (be == -1) return NULL; // not UTF-16 |
---|
| 430 | |
---|
| 431 | u = malloc(max); |
---|
| 432 | for (sl = 2; sl < *len - 1; sl += 2) { |
---|
| 433 | c = (be) ? (((*s)[sl] & 0xFF) << 8) | ((*s)[sl + 1] & 0xFF) //UTF-16BE |
---|
| 434 | : (((*s)[sl + 1] & 0xFF) << 8) | ((*s)[sl] & 0xFF); //UTF-16LE |
---|
| 435 | if (c >= 0xD800 && c <= 0xDFFF && (sl += 2) < *len - 1) { // high-half |
---|
| 436 | d = (be) ? (((*s)[sl] & 0xFF) << 8) | ((*s)[sl + 1] & 0xFF) |
---|
| 437 | : (((*s)[sl + 1] & 0xFF) << 8) | ((*s)[sl] & 0xFF); |
---|
| 438 | c = (((c & 0x3FF) << 10) | (d & 0x3FF)) + 0x10000; |
---|
| 439 | } |
---|
| 440 | |
---|
| 441 | while (l + 6 > max) u = realloc(u, max += EZXML_BUFSIZE); |
---|
| 442 | if (c < 0x80) u[l++] = c; // US-ASCII subset |
---|
| 443 | else { // multi-byte UTF-8 sequence |
---|
| 444 | for (b = 0, d = c; d; d /= 2) b++; // bits in c |
---|
| 445 | b = (b - 2) / 5; // bytes in payload |
---|
| 446 | u[l++] = (0xFF << (7 - b)) | (c >> (6 * b)); // head |
---|
| 447 | while (b) u[l++] = 0x80 | ((c >> (6 * --b)) & 0x3F); // payload |
---|
| 448 | } |
---|
| 449 | } |
---|
| 450 | return *s = realloc(u, *len = l); |
---|
| 451 | } |
---|
| 452 | |
---|
| 453 | // frees a tag attribute list |
---|
| 454 | void ezxml_free_attr(char **attr) { |
---|
| 455 | int i = 0; |
---|
| 456 | char *m; |
---|
| 457 | |
---|
| 458 | if (! attr || attr == EZXML_NIL) return; // nothing to free |
---|
| 459 | while (attr[i]) i += 2; // find end of attribute list |
---|
| 460 | m = attr[i + 1]; // list of which names and values are malloced |
---|
| 461 | for (i = 0; m[i]; i++) { |
---|
| 462 | if (m[i] & EZXML_NAMEM) free(attr[i * 2]); |
---|
| 463 | if (m[i] & EZXML_TXTM) free(attr[(i * 2) + 1]); |
---|
| 464 | } |
---|
| 465 | free(m); |
---|
| 466 | free(attr); |
---|
| 467 | } |
---|
| 468 | |
---|
| 469 | // parse the given xml string and return an ezxml structure |
---|
| 470 | ezxml_t ezxml_parse_str(char *s, size_t len) |
---|
| 471 | { |
---|
| 472 | ezxml_root_t root = (ezxml_root_t)ezxml_new(NULL); |
---|
| 473 | char q, e, *d, **attr, **a = NULL; // initialize a to avoid compile warning |
---|
| 474 | int l, i, j; |
---|
| 475 | |
---|
| 476 | root->m = s; |
---|
| 477 | if (! len) return ezxml_err(root, NULL, "root tag missing"); |
---|
| 478 | root->u = ezxml_str2utf8(&s, &len); // convert utf-16 to utf-8 |
---|
| 479 | root->e = (root->s = s) + len; // record start and end of work area |
---|
| 480 | |
---|
| 481 | e = s[len - 1]; // save end char |
---|
| 482 | s[len - 1] = '\0'; // turn end char into null terminator |
---|
| 483 | |
---|
| 484 | while (*s && *s != '<') s++; // find first tag |
---|
| 485 | if (! *s) return ezxml_err(root, s, "root tag missing"); |
---|
| 486 | |
---|
| 487 | for (; ; ) { |
---|
| 488 | attr = (char **)EZXML_NIL; |
---|
| 489 | d = ++s; |
---|
| 490 | |
---|
| 491 | if (isalpha(*s) || *s == '_' || *s == ':' || *s < '\0') { // new tag |
---|
| 492 | if (! root->cur) |
---|
| 493 | return ezxml_err(root, d, "markup outside of root element"); |
---|
| 494 | |
---|
| 495 | s += strcspn(s, EZXML_WS "/>"); |
---|
| 496 | while (isspace(*s)) *(s++) = '\0'; // null terminate tag name |
---|
| 497 | |
---|
| 498 | if (*s && *s != '/' && *s != '>') // find tag in default attr list |
---|
| 499 | for (i = 0; (a = root->attr[i]) && strcmp(a[0], d); i++); |
---|
| 500 | |
---|
| 501 | for (l = 0; *s && *s != '/' && *s != '>'; l += 2) { // new attrib |
---|
| 502 | attr = (l) ? realloc(attr, (l + 4) * sizeof(char *)) |
---|
| 503 | : malloc(4 * sizeof(char *)); // allocate space |
---|
| 504 | attr[l + 3] = (l) ? realloc(attr[l + 1], (l / 2) + 2) |
---|
| 505 | : malloc(2); // mem for list of maloced vals |
---|
| 506 | strcpy(attr[l + 3] + (l / 2), " "); // value is not malloced |
---|
| 507 | attr[l + 2] = NULL; // null terminate list |
---|
| 508 | attr[l + 1] = ""; // temporary attribute value |
---|
| 509 | attr[l] = s; // set attribute name |
---|
| 510 | |
---|
| 511 | s += strcspn(s, EZXML_WS "=/>"); |
---|
| 512 | if (*s == '=' || isspace(*s)) { |
---|
| 513 | *(s++) = '\0'; // null terminate tag attribute name |
---|
| 514 | q = *(s += strspn(s, EZXML_WS "=")); |
---|
| 515 | if (q == '"' || q == '\'') { // attribute value |
---|
| 516 | attr[l + 1] = ++s; |
---|
| 517 | while (*s && *s != q) s++; |
---|
| 518 | if (*s) *(s++) = '\0'; // null terminate attribute val |
---|
| 519 | else { |
---|
| 520 | ezxml_free_attr(attr); |
---|
| 521 | return ezxml_err(root, d, "missing %c", q); |
---|
| 522 | } |
---|
| 523 | |
---|
| 524 | for (j = 1; a && a[j] && strcmp(a[j], attr[l]); j +=3); |
---|
| 525 | attr[l + 1] = ezxml_decode(attr[l + 1], root->ent, (a |
---|
| 526 | && a[j]) ? *a[j + 2] : ' '); |
---|
| 527 | if (attr[l + 1] < d || attr[l + 1] > s) |
---|
| 528 | attr[l + 3][l / 2] = EZXML_TXTM; // value malloced |
---|
| 529 | } |
---|
| 530 | } |
---|
| 531 | while (isspace(*s)) s++; |
---|
| 532 | } |
---|
| 533 | |
---|
| 534 | if (*s == '/') { // self closing tag |
---|
| 535 | *(s++) = '\0'; |
---|
| 536 | if ((*s && *s != '>') || (! *s && e != '>')) { |
---|
| 537 | if (l) ezxml_free_attr(attr); |
---|
| 538 | return ezxml_err(root, d, "missing >"); |
---|
| 539 | } |
---|
| 540 | ezxml_open_tag(root, d, attr); |
---|
| 541 | ezxml_close_tag(root, d, s); |
---|
| 542 | } |
---|
| 543 | else if ((q = *s) == '>' || (! *s && e == '>')) { // open tag |
---|
| 544 | *s = '\0'; // temporarily null terminate tag name |
---|
| 545 | ezxml_open_tag(root, d, attr); |
---|
| 546 | *s = q; |
---|
| 547 | } |
---|
| 548 | else { |
---|
| 549 | if (l) ezxml_free_attr(attr); |
---|
| 550 | return ezxml_err(root, d, "missing >"); |
---|
| 551 | } |
---|
| 552 | } |
---|
| 553 | else if (*s == '/') { // close tag |
---|
| 554 | s += strcspn(d = s + 1, EZXML_WS ">") + 1; |
---|
| 555 | if (! (q = *s) && e != '>') return ezxml_err(root, d, "missing >"); |
---|
| 556 | *s = '\0'; // temporarily null terminate tag name |
---|
| 557 | if (ezxml_close_tag(root, d, s)) return &root->xml; |
---|
| 558 | if (isspace(*s = q)) s += strspn(s, EZXML_WS); |
---|
| 559 | } |
---|
| 560 | else if (! strncmp(s, "!--", 3)) { // xml comment |
---|
| 561 | if (! (s = strstr(s + 3, "--")) || (*(s += 2) != '>' && *s) || |
---|
| 562 | (! *s && e != '>')) return ezxml_err(root, d, "unclosed <!--"); |
---|
| 563 | } |
---|
| 564 | else if (! strncmp(s, "![CDATA[", 8)) { // cdata |
---|
| 565 | if ((s = strstr(s, "]]>"))) |
---|
| 566 | ezxml_char_content(root, d + 8, (s += 2) - d - 10, 'c'); |
---|
| 567 | else return ezxml_err(root, d, "unclosed <![CDATA["); |
---|
| 568 | } |
---|
| 569 | else if (! strncmp(s, "!DOCTYPE", 8)) { // dtd |
---|
| 570 | for (l = 0; *s && ((! l && *s != '>') || (l && (*s != ']' || |
---|
| 571 | *(s + strspn(s + 1, EZXML_WS) + 1) != '>'))); |
---|
| 572 | l = (*s == '[') ? 1 : l) s += strcspn(s + 1, "[]>") + 1; |
---|
| 573 | if (! *s && e != '>') |
---|
| 574 | return ezxml_err(root, d, "unclosed <!DOCTYPE"); |
---|
| 575 | d = (l) ? strchr(d, '[') + 1 : d; |
---|
| 576 | if (l && ! ezxml_internal_dtd(root, d, s++ - d)) return &root->xml; |
---|
| 577 | } |
---|
| 578 | else if (*s == '?') { // <?...?> processing instructions |
---|
| 579 | do { s = strchr(s, '?'); } while (s && *(++s) && *s != '>'); |
---|
| 580 | if (! s || (! *s && e != '>')) |
---|
| 581 | return ezxml_err(root, d, "unclosed <?"); |
---|
| 582 | else ezxml_proc_inst(root, d + 1, s - d - 2); |
---|
| 583 | } |
---|
| 584 | else return ezxml_err(root, d, "unexpected <"); |
---|
| 585 | |
---|
| 586 | if (! s || ! *s) break; |
---|
| 587 | *s = '\0'; |
---|
| 588 | d = ++s; |
---|
| 589 | if (*s && *s != '<') { // tag character content |
---|
| 590 | while (*s && *s != '<') s++; |
---|
| 591 | if (*s) ezxml_char_content(root, d, s - d, '&'); |
---|
| 592 | else break; |
---|
| 593 | } |
---|
| 594 | else if (! *s) break; |
---|
| 595 | } |
---|
| 596 | |
---|
| 597 | if (! root->cur) return &root->xml; |
---|
| 598 | else if (! root->cur->name) return ezxml_err(root, d, "root tag missing"); |
---|
| 599 | else return ezxml_err(root, d, "unclosed tag <%s>", root->cur->name); |
---|
| 600 | } |
---|
| 601 | |
---|
| 602 | // Wrapper for ezxml_parse_str() that accepts a file stream. Reads the entire |
---|
| 603 | // stream into memory and then parses it. For xml files, use ezxml_parse_file() |
---|
| 604 | // or ezxml_parse_fd() |
---|
| 605 | ezxml_t ezxml_parse_fp(FILE *fp) |
---|
| 606 | { |
---|
| 607 | ezxml_root_t root; |
---|
| 608 | size_t l, len = 0; |
---|
| 609 | char *s; |
---|
| 610 | |
---|
| 611 | if (! (s = malloc(EZXML_BUFSIZE))) return NULL; |
---|
| 612 | do { |
---|
| 613 | len += (l = fread((s + len), 1, EZXML_BUFSIZE, fp)); |
---|
| 614 | if (l == EZXML_BUFSIZE) s = realloc(s, len + EZXML_BUFSIZE); |
---|
| 615 | } while (s && l == EZXML_BUFSIZE); |
---|
| 616 | |
---|
| 617 | if (! s) return NULL; |
---|
| 618 | root = (ezxml_root_t)ezxml_parse_str(s, len); |
---|
| 619 | root->len = -1; // so we know to free s in ezxml_free() |
---|
| 620 | return &root->xml; |
---|
| 621 | } |
---|
| 622 | |
---|
| 623 | // A wrapper for ezxml_parse_str() that accepts a file descriptor. First |
---|
| 624 | // attempts to mem map the file. Failing that, reads the file into memory. |
---|
| 625 | // Returns NULL on failure. |
---|
| 626 | ezxml_t ezxml_parse_fd(int fd) |
---|
| 627 | { |
---|
| 628 | ezxml_root_t root; |
---|
| 629 | struct stat st; |
---|
| 630 | size_t l; |
---|
| 631 | void *m; |
---|
| 632 | |
---|
| 633 | if (fd < 0) return NULL; |
---|
| 634 | fstat(fd, &st); |
---|
| 635 | |
---|
| 636 | #ifndef EZXML_NOMMAP |
---|
| 637 | l = (st.st_size + sysconf(_SC_PAGESIZE) - 1) & ~(sysconf(_SC_PAGESIZE) -1); |
---|
| 638 | if ((m = mmap(NULL, l, PROT_READ | PROT_WRITE, MAP_PRIVATE, fd, 0)) != |
---|
| 639 | MAP_FAILED) { |
---|
| 640 | madvise(m, l, MADV_SEQUENTIAL); // optimize for sequential access |
---|
| 641 | root = (ezxml_root_t)ezxml_parse_str(m, st.st_size); |
---|
| 642 | madvise(m, root->len = l, MADV_NORMAL); // put it back to normal |
---|
| 643 | } |
---|
| 644 | else { // mmap failed, read file into memory |
---|
| 645 | #endif // EZXML_NOMMAP |
---|
| 646 | l = read(fd, m = malloc(st.st_size), st.st_size); |
---|
| 647 | root = (ezxml_root_t)ezxml_parse_str(m, l); |
---|
| 648 | root->len = -1; // so we know to free s in ezxml_free() |
---|
| 649 | #ifndef EZXML_NOMMAP |
---|
| 650 | } |
---|
| 651 | #endif // EZXML_NOMMAP |
---|
| 652 | return &root->xml; |
---|
| 653 | } |
---|
| 654 | |
---|
| 655 | // a wrapper for ezxml_parse_fd that accepts a file name |
---|
| 656 | ezxml_t ezxml_parse_file(const char *file) |
---|
| 657 | { |
---|
| 658 | int fd = open(file, O_RDONLY, 0); |
---|
| 659 | ezxml_t xml = ezxml_parse_fd(fd); |
---|
| 660 | |
---|
| 661 | if (fd >= 0) close(fd); |
---|
| 662 | return xml; |
---|
| 663 | } |
---|
| 664 | |
---|
| 665 | // Encodes ampersand sequences appending the results to *dst, reallocating *dst |
---|
| 666 | // if length excedes max. a is non-zero for attribute encoding. Returns *dst |
---|
| 667 | char *ezxml_ampencode(const char *s, size_t len, char **dst, size_t *dlen, |
---|
| 668 | size_t *max, short a) |
---|
| 669 | { |
---|
| 670 | const char *e; |
---|
| 671 | |
---|
| 672 | for (e = s + len; s != e; s++) { |
---|
| 673 | while (*dlen + 10 > *max) *dst = realloc(*dst, *max += EZXML_BUFSIZE); |
---|
| 674 | |
---|
| 675 | switch (*s) { |
---|
| 676 | case '\0': return *dst; |
---|
| 677 | case '&': *dlen += sprintf(*dst + *dlen, "&"); break; |
---|
| 678 | case '<': *dlen += sprintf(*dst + *dlen, "<"); break; |
---|
| 679 | case '>': *dlen += sprintf(*dst + *dlen, ">"); break; |
---|
| 680 | case '"': *dlen += sprintf(*dst + *dlen, (a) ? """ : "\""); break; |
---|
| 681 | case '\n': *dlen += sprintf(*dst + *dlen, (a) ? "
" : "\n"); break; |
---|
| 682 | case '\t': *dlen += sprintf(*dst + *dlen, (a) ? "	" : "\t"); break; |
---|
| 683 | case '\r': *dlen += sprintf(*dst + *dlen, "
"); break; |
---|
| 684 | default: (*dst)[(*dlen)++] = *s; |
---|
| 685 | } |
---|
| 686 | } |
---|
| 687 | return *dst; |
---|
| 688 | } |
---|
| 689 | |
---|
| 690 | // Recursively converts each tag to xml appending it to *s. Reallocates *s if |
---|
| 691 | // its length excedes max. start is the location of the previous tag in the |
---|
| 692 | // parent tag's character content. Returns *s. |
---|
| 693 | char *ezxml_toxml_r(ezxml_t xml, char **s, size_t *len, size_t *max, |
---|
| 694 | size_t start, char ***attr) |
---|
| 695 | { |
---|
| 696 | int i, j; |
---|
| 697 | char *txt = (xml->parent) ? xml->parent->txt : ""; |
---|
| 698 | size_t off = 0; |
---|
| 699 | |
---|
| 700 | // parent character content up to this tag |
---|
| 701 | *s = ezxml_ampencode(txt + start, xml->off - start, s, len, max, 0); |
---|
| 702 | |
---|
| 703 | while (*len + strlen(xml->name) + 4 > *max) // reallocate s |
---|
| 704 | *s = realloc(*s, *max += EZXML_BUFSIZE); |
---|
| 705 | |
---|
| 706 | *len += sprintf(*s + *len, "<%s", xml->name); // open tag |
---|
| 707 | for (i = 0; xml->attr[i]; i += 2) { // tag attributes |
---|
| 708 | if (ezxml_attr(xml, xml->attr[i]) != xml->attr[i + 1]) continue; |
---|
| 709 | while (*len + strlen(xml->attr[i]) + 7 > *max) // reallocate s |
---|
| 710 | *s = realloc(*s, *max += EZXML_BUFSIZE); |
---|
| 711 | |
---|
| 712 | *len += sprintf(*s + *len, " %s=\"", xml->attr[i]); |
---|
| 713 | ezxml_ampencode(xml->attr[i + 1], -1, s, len, max, 1); |
---|
| 714 | *len += sprintf(*s + *len, "\""); |
---|
| 715 | } |
---|
| 716 | |
---|
| 717 | for (i = 0; attr[i] && strcmp(attr[i][0], xml->name); i++); |
---|
| 718 | for (j = 1; attr[i] && attr[i][j]; j += 3) { // default attributes |
---|
| 719 | if (! attr[i][j + 1] || ezxml_attr(xml, attr[i][j]) != attr[i][j + 1]) |
---|
| 720 | continue; // skip duplicates and non-values |
---|
| 721 | while (*len + strlen(attr[i][j]) + 7 > *max) // reallocate s |
---|
| 722 | *s = realloc(*s, *max += EZXML_BUFSIZE); |
---|
| 723 | |
---|
| 724 | *len += sprintf(*s + *len, " %s=\"", attr[i][j]); |
---|
| 725 | ezxml_ampencode(attr[i][j + 1], -1, s, len, max, 1); |
---|
| 726 | *len += sprintf(*s + *len, "\""); |
---|
| 727 | } |
---|
| 728 | *len += sprintf(*s + *len, ">"); |
---|
| 729 | |
---|
| 730 | *s = (xml->child) ? ezxml_toxml_r(xml->child, s, len, max, 0, attr) //child |
---|
| 731 | : ezxml_ampencode(xml->txt, -1, s, len, max, 0); //data |
---|
| 732 | |
---|
| 733 | while (*len + strlen(xml->name) + 4 > *max) // reallocate s |
---|
| 734 | *s = realloc(*s, *max += EZXML_BUFSIZE); |
---|
| 735 | |
---|
| 736 | *len += sprintf(*s + *len, "</%s>", xml->name); // close tag |
---|
| 737 | |
---|
| 738 | while (txt[off] && off < xml->off) off++; // make sure off is within bounds |
---|
| 739 | return (xml->ordered) ? ezxml_toxml_r(xml->ordered, s, len, max, off, attr) |
---|
| 740 | : ezxml_ampencode(txt + off, -1, s, len, max, 0); |
---|
| 741 | } |
---|
| 742 | |
---|
| 743 | // Converts an ezxml structure back to xml. Returns a string of xml data that |
---|
| 744 | // must be freed. |
---|
| 745 | char *ezxml_toxml(ezxml_t xml) |
---|
| 746 | { |
---|
| 747 | ezxml_t p = (xml) ? xml->parent : NULL, o = (xml) ? xml->ordered : NULL; |
---|
| 748 | ezxml_root_t root = (ezxml_root_t)xml; |
---|
| 749 | size_t len = 0, max = EZXML_BUFSIZE; |
---|
| 750 | char *s = strcpy(malloc(max), ""), *t, *n; |
---|
| 751 | int i, j, k; |
---|
| 752 | |
---|
| 753 | if (! xml || ! xml->name) return realloc(s, len + 1); |
---|
| 754 | while (root->xml.parent) root = (ezxml_root_t)root->xml.parent; // root tag |
---|
| 755 | |
---|
| 756 | for (i = 0; ! p && root->pi[i]; i++) { // pre-root processing instructions |
---|
| 757 | for (k = 2; root->pi[i][k - 1]; k++); |
---|
| 758 | for (j = 1; (n = root->pi[i][j]); j++) { |
---|
| 759 | if (root->pi[i][k][j - 1] == '>') continue; // not pre-root |
---|
| 760 | while (len + strlen(t = root->pi[i][0]) + strlen(n) + 7 > max) |
---|
| 761 | s = realloc(s, max += EZXML_BUFSIZE); |
---|
| 762 | len += sprintf(s + len, "<?%s%s%s?>\n", t, *n ? " " : "", n); |
---|
| 763 | } |
---|
| 764 | } |
---|
| 765 | |
---|
| 766 | xml->parent = xml->ordered = NULL; |
---|
| 767 | s = ezxml_toxml_r(xml, &s, &len, &max, 0, root->attr); |
---|
| 768 | xml->parent = p; |
---|
| 769 | xml->ordered = o; |
---|
| 770 | |
---|
| 771 | for (i = 0; ! p && root->pi[i]; i++) { // post-root processing instructions |
---|
| 772 | for (k = 2; root->pi[i][k - 1]; k++); |
---|
| 773 | for (j = 1; (n = root->pi[i][j]); j++) { |
---|
| 774 | if (root->pi[i][k][j - 1] == '<') continue; // not post-root |
---|
| 775 | while (len + strlen(t = root->pi[i][0]) + strlen(n) + 7 > max) |
---|
| 776 | s = realloc(s, max += EZXML_BUFSIZE); |
---|
| 777 | len += sprintf(s + len, "\n<?%s%s%s?>", t, *n ? " " : "", n); |
---|
| 778 | } |
---|
| 779 | } |
---|
| 780 | return realloc(s, len + 1); |
---|
| 781 | } |
---|
| 782 | |
---|
| 783 | // free the memory allocated for the ezxml structure |
---|
| 784 | void ezxml_free(ezxml_t xml) |
---|
| 785 | { |
---|
| 786 | ezxml_root_t root = (ezxml_root_t)xml; |
---|
| 787 | int i, j; |
---|
| 788 | char **a, *s; |
---|
| 789 | |
---|
| 790 | if (! xml) return; |
---|
| 791 | ezxml_free(xml->child); |
---|
| 792 | ezxml_free(xml->ordered); |
---|
| 793 | |
---|
| 794 | if (! xml->parent) { // free root tag allocations |
---|
| 795 | for (i = 10; root->ent[i]; i += 2) // 0 - 9 are default entites (<>&"') |
---|
| 796 | if ((s = root->ent[i + 1]) < root->s || s > root->e) free(s); |
---|
| 797 | free(root->ent); // free list of general entities |
---|
| 798 | |
---|
| 799 | for (i = 0; (a = root->attr[i]); i++) { |
---|
| 800 | for (j = 1; a[j++]; j += 2) // free malloced attribute values |
---|
| 801 | if (a[j] && (a[j] < root->s || a[j] > root->e)) free(a[j]); |
---|
| 802 | free(a); |
---|
| 803 | } |
---|
| 804 | if (root->attr[0]) free(root->attr); // free default attribute list |
---|
| 805 | |
---|
| 806 | for (i = 0; root->pi[i]; i++) { |
---|
| 807 | for (j = 1; root->pi[i][j]; j++); |
---|
| 808 | free(root->pi[i][j + 1]); |
---|
| 809 | free(root->pi[i]); |
---|
| 810 | } |
---|
| 811 | if (root->pi[0]) free(root->pi); // free processing instructions |
---|
| 812 | |
---|
| 813 | if (root->len == -1) free(root->m); // malloced xml data |
---|
| 814 | #ifndef EZXML_NOMMAP |
---|
| 815 | else if (root->len) munmap(root->m, root->len); // mem mapped xml data |
---|
| 816 | #endif // EZXML_NOMMAP |
---|
| 817 | if (root->u) free(root->u); // utf8 conversion |
---|
| 818 | } |
---|
| 819 | |
---|
| 820 | ezxml_free_attr(xml->attr); // tag attributes |
---|
| 821 | if ((xml->flags & EZXML_TXTM)) free(xml->txt); // character content |
---|
| 822 | if ((xml->flags & EZXML_NAMEM)) free(xml->name); // tag name |
---|
| 823 | free(xml); |
---|
| 824 | } |
---|
| 825 | |
---|
| 826 | // return parser error message or empty string if none |
---|
| 827 | const char *ezxml_error(ezxml_t xml) |
---|
| 828 | { |
---|
| 829 | while (xml && xml->parent) xml = xml->parent; // find root tag |
---|
| 830 | return (xml) ? ((ezxml_root_t)xml)->err : ""; |
---|
| 831 | } |
---|
| 832 | |
---|
| 833 | // returns a new empty ezxml structure with the given root tag name |
---|
| 834 | ezxml_t ezxml_new(const char *name) |
---|
| 835 | { |
---|
| 836 | static char *ent[] = { "lt;", "<", "gt;", ">", "quot;", """, |
---|
| 837 | "apos;", "'", "amp;", "&", NULL }; |
---|
| 838 | ezxml_root_t root = (ezxml_root_t)memset(malloc(sizeof(struct ezxml_root)), |
---|
| 839 | '\0', sizeof(struct ezxml_root)); |
---|
| 840 | root->xml.name = (char *)name; |
---|
| 841 | root->cur = &root->xml; |
---|
| 842 | strcpy(root->err, root->xml.txt = ""); |
---|
| 843 | root->ent = memcpy(malloc(sizeof(ent)), ent, sizeof(ent)); |
---|
| 844 | root->attr = root->pi = (char ***)(root->xml.attr = EZXML_NIL); |
---|
| 845 | return &root->xml; |
---|
| 846 | } |
---|
| 847 | |
---|
| 848 | // inserts an existing tag into an ezxml structure |
---|
| 849 | ezxml_t ezxml_insert(ezxml_t xml, ezxml_t dest, size_t off) |
---|
| 850 | { |
---|
| 851 | ezxml_t cur, prev, head; |
---|
| 852 | |
---|
| 853 | xml->next = xml->sibling = xml->ordered = NULL; |
---|
| 854 | xml->off = off; |
---|
| 855 | xml->parent = dest; |
---|
| 856 | |
---|
| 857 | if ((head = dest->child)) { // already have sub tags |
---|
| 858 | if (head->off <= off) { // not first subtag |
---|
| 859 | for (cur = head; cur->ordered && cur->ordered->off <= off; |
---|
| 860 | cur = cur->ordered); |
---|
| 861 | xml->ordered = cur->ordered; |
---|
| 862 | cur->ordered = xml; |
---|
| 863 | } |
---|
| 864 | else { // first subtag |
---|
| 865 | xml->ordered = head; |
---|
| 866 | dest->child = xml; |
---|
| 867 | } |
---|
| 868 | |
---|
| 869 | for (cur = head, prev = NULL; cur && strcmp(cur->name, xml->name); |
---|
| 870 | prev = cur, cur = cur->sibling); // find tag type |
---|
| 871 | if (cur && cur->off <= off) { // not first of type |
---|
| 872 | while (cur->next && cur->next->off <= off) cur = cur->next; |
---|
| 873 | xml->next = cur->next; |
---|
| 874 | cur->next = xml; |
---|
| 875 | } |
---|
| 876 | else { // first tag of this type |
---|
| 877 | if (prev && cur) prev->sibling = cur->sibling; // remove old first |
---|
| 878 | xml->next = cur; // old first tag is now next |
---|
| 879 | for (cur = head, prev = NULL; cur && cur->off <= off; |
---|
| 880 | prev = cur, cur = cur->sibling); // new sibling insert point |
---|
| 881 | xml->sibling = cur; |
---|
| 882 | if (prev) prev->sibling = xml; |
---|
| 883 | } |
---|
| 884 | } |
---|
| 885 | else dest->child = xml; // only sub tag |
---|
| 886 | |
---|
| 887 | return xml; |
---|
| 888 | } |
---|
| 889 | |
---|
| 890 | // Adds a child tag. off is the offset of the child tag relative to the start |
---|
| 891 | // of the parent tag's character content. Returns the child tag. |
---|
| 892 | ezxml_t ezxml_add_child(ezxml_t xml, const char *name, size_t off) |
---|
| 893 | { |
---|
| 894 | ezxml_t child; |
---|
| 895 | |
---|
| 896 | if (! xml) return NULL; |
---|
| 897 | child = (ezxml_t)memset(malloc(sizeof(struct ezxml)), '\0', |
---|
| 898 | sizeof(struct ezxml)); |
---|
| 899 | child->name = (char *)name; |
---|
| 900 | child->attr = EZXML_NIL; |
---|
| 901 | child->txt = ""; |
---|
| 902 | |
---|
| 903 | return ezxml_insert(child, xml, off); |
---|
| 904 | } |
---|
| 905 | |
---|
| 906 | // sets the character content for the given tag and returns the tag |
---|
| 907 | ezxml_t ezxml_set_txt(ezxml_t xml, const char *txt) |
---|
| 908 | { |
---|
| 909 | if (! xml) return NULL; |
---|
| 910 | if (xml->flags & EZXML_TXTM) free(xml->txt); // existing txt was malloced |
---|
| 911 | xml->flags &= ~EZXML_TXTM; |
---|
| 912 | xml->txt = (char *)txt; |
---|
| 913 | return xml; |
---|
| 914 | } |
---|
| 915 | |
---|
| 916 | // Sets the given tag attribute or adds a new attribute if not found. A value |
---|
| 917 | // of NULL will remove the specified attribute. Returns the tag given. |
---|
| 918 | ezxml_t ezxml_set_attr(ezxml_t xml, const char *name, const char *value) |
---|
| 919 | { |
---|
| 920 | int l = 0, c; |
---|
| 921 | |
---|
| 922 | if (! xml) return NULL; |
---|
| 923 | while (xml->attr[l] && strcmp(xml->attr[l], name)) l += 2; |
---|
| 924 | if (! xml->attr[l]) { // not found, add as new attribute |
---|
| 925 | if (! value) return xml; // nothing to do |
---|
| 926 | if (xml->attr == EZXML_NIL) { // first attribute |
---|
| 927 | xml->attr = malloc(4 * sizeof(char *)); |
---|
| 928 | xml->attr[1] = strdup(""); // empty list of malloced names/vals |
---|
| 929 | } |
---|
| 930 | else xml->attr = realloc(xml->attr, (l + 4) * sizeof(char *)); |
---|
| 931 | |
---|
| 932 | xml->attr[l] = (char *)name; // set attribute name |
---|
| 933 | xml->attr[l + 2] = NULL; // null terminate attribute list |
---|
| 934 | xml->attr[l + 3] = realloc(xml->attr[l + 1], |
---|
| 935 | (c = strlen(xml->attr[l + 1])) + 2); |
---|
| 936 | strcpy(xml->attr[l + 3] + c, " "); // set name/value as not malloced |
---|
| 937 | if (xml->flags & EZXML_DUP) xml->attr[l + 3][c] = EZXML_NAMEM; |
---|
| 938 | } |
---|
| 939 | else if (xml->flags & EZXML_DUP) free((char *)name); // name was strduped |
---|
| 940 | |
---|
| 941 | for (c = l; xml->attr[c]; c += 2); // find end of attribute list |
---|
| 942 | if (xml->attr[c + 1][l / 2] & EZXML_TXTM) free(xml->attr[l + 1]); //old val |
---|
| 943 | if (xml->flags & EZXML_DUP) xml->attr[c + 1][l / 2] |= EZXML_TXTM; |
---|
| 944 | else xml->attr[c + 1][l / 2] &= ~EZXML_TXTM; |
---|
| 945 | |
---|
| 946 | if (value) xml->attr[l + 1] = (char *)value; // set attribute value |
---|
| 947 | else { // remove attribute |
---|
| 948 | if (xml->attr[c + 1][l / 2] & EZXML_NAMEM) free(xml->attr[l]); |
---|
| 949 | memmove(xml->attr + l, xml->attr + l + 2, (c - l + 2) * sizeof(char*)); |
---|
| 950 | xml->attr = realloc(xml->attr, (c + 2) * sizeof(char *)); |
---|
| 951 | memmove(xml->attr[c + 1] + (l / 2), xml->attr[c + 1] + (l / 2) + 1, |
---|
| 952 | (c / 2) - (l / 2)); // fix list of which name/vals are malloced |
---|
| 953 | } |
---|
| 954 | xml->flags &= ~EZXML_DUP; // clear strdup() flag |
---|
| 955 | return xml; |
---|
| 956 | } |
---|
| 957 | |
---|
| 958 | // sets a flag for the given tag and returns the tag |
---|
| 959 | ezxml_t ezxml_set_flag(ezxml_t xml, short flag) |
---|
| 960 | { |
---|
| 961 | if (xml) xml->flags |= flag; |
---|
| 962 | return xml; |
---|
| 963 | } |
---|
| 964 | |
---|
| 965 | // removes a tag along with its subtags without freeing its memory |
---|
| 966 | ezxml_t ezxml_cut(ezxml_t xml) |
---|
| 967 | { |
---|
| 968 | ezxml_t cur; |
---|
| 969 | |
---|
| 970 | if (! xml) return NULL; // nothing to do |
---|
| 971 | if (xml->next) xml->next->sibling = xml->sibling; // patch sibling list |
---|
| 972 | |
---|
| 973 | if (xml->parent) { // not root tag |
---|
| 974 | cur = xml->parent->child; // find head of subtag list |
---|
| 975 | if (cur == xml) xml->parent->child = xml->ordered; // first subtag |
---|
| 976 | else { // not first subtag |
---|
| 977 | while (cur->ordered != xml) cur = cur->ordered; |
---|
| 978 | cur->ordered = cur->ordered->ordered; // patch ordered list |
---|
| 979 | |
---|
| 980 | cur = xml->parent->child; // go back to head of subtag list |
---|
| 981 | if (strcmp(cur->name, xml->name)) { // not in first sibling list |
---|
| 982 | while (strcmp(cur->sibling->name, xml->name)) |
---|
| 983 | cur = cur->sibling; |
---|
| 984 | if (cur->sibling == xml) { // first of a sibling list |
---|
| 985 | cur->sibling = (xml->next) ? xml->next |
---|
| 986 | : cur->sibling->sibling; |
---|
| 987 | } |
---|
| 988 | else cur = cur->sibling; // not first of a sibling list |
---|
| 989 | } |
---|
| 990 | |
---|
| 991 | while (cur->next && cur->next != xml) cur = cur->next; |
---|
| 992 | if (cur->next) cur->next = cur->next->next; // patch next list |
---|
| 993 | } |
---|
| 994 | } |
---|
| 995 | xml->ordered = xml->sibling = xml->next = NULL; |
---|
| 996 | return xml; |
---|
| 997 | } |
---|
| 998 | |
---|
| 999 | #ifdef EZXML_TEST // test harness |
---|
| 1000 | int main(int argc, char **argv) |
---|
| 1001 | { |
---|
| 1002 | ezxml_t xml; |
---|
| 1003 | char *s; |
---|
| 1004 | int i; |
---|
| 1005 | |
---|
| 1006 | if (argc != 2) return fprintf(stderr, "usage: %s xmlfile\n", argv[0]); |
---|
| 1007 | |
---|
| 1008 | xml = ezxml_parse_file(argv[1]); |
---|
| 1009 | printf("%s\n", (s = ezxml_toxml(xml))); |
---|
| 1010 | free(s); |
---|
| 1011 | i = fprintf(stderr, "%s", ezxml_error(xml)); |
---|
| 1012 | ezxml_free(xml); |
---|
| 1013 | return (i) ? 1 : 0; |
---|
| 1014 | } |
---|
| 1015 | #endif // EZXML_TEST |
---|